I upgraded yesterday manually ( using the flasher ) to PR1.3 and one thing I noticed is that few applications stopped working. I did a full reflash of the main firmware and the eMMC. It was the same. The applications mentioned are HealthCheck and Wifi-Eye - both of them require python2.5-qt4-common (4.7.4-maemo0) libraries, but the PR1.3 comes with (4.7.5-maemo1) from there the conflict. Even if you manually downgrade to 4.7.4 the applications would not run - just crash.
Another interesting thing is that my ICQ and Yahoo accounts would not sign in. I am using skype, ovi, facebook, msn, yahoo and icq. All except ICQ and Yahoo do sign in properly. Anyone similar?